1. Department of Information Engineering, University of Padova, Padova, Italy
2. G.tec Medical Engineering GmbH, Schiedlberg, Austria
3. School of Public Health, Physiotherapy and Sports Science, University College Dublin, Dublin 4, Ireland
4. Bath Institute for Augmented Human, University of Bath, Bath, U.K.
5. Department of Neurosciences, University of Padova, Padova, Italy